Siemens SINUMERIK 840Di Function Manual page 1200

Detailed Description
2.2 Reserve resources (timers, counters, FC, FB, DB, I/O)
2.2 Reserve resources (timers, counters, FC, FB, DB, I/O)
2.2
Reserve resources (timers, counters, FC, FB, DB, I/O)
The components below are reserved for the basic program:
Timers
No reservation.
Counters
No reservation.
FC, FB, DB
FC 0 to FC 29 and FB 0 to FB 29 are reserved for the basic program.
The number range between 1000 and 1023 is also reserved for FCs and FBs. Data blocks
DB 1 to DB 62 and DB 71 to DB 80 are reserved.
The number range between 1000 and 1099 is also reserved for data blocks.
Data blocks from non-activated channels, axes/spindles and tool management are free for
the user.
I/O range:
The PLC 317 has an I/O address volume of 8192 bytes each for inputs and outputs. The
address ranges starting at 4096/4096 are reserved for/occupied by integrated drives.
However, diagnostic addresses for modules can be assigned to the highest address range
as proposed by STEP7. Furthermore, the address range between 256 and 287 is assigned
for the NCK, CP and HMI in rack 0 on the SIMATIC 300 station.
2-6
PLC Basic Program Solution Line (P3 sl)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0